The aim: Arteriovenous malformations (AVM) may be visualized using transcranial color-coded duplex ultrasonography (TCCS). The research presented aimed at examining typical sonographic characteristics and visualization of AVM in relation to their location. Methods: In the course of 6 years ultrasonographic prospective examination was used in 54 patients with AVM demonstrated by means of angiography. The arteries of circulus arterious Willisi were identified on the base of location, anatomical course and flow direction. During the first 3 years, investigations were realized using ultrasonographic system Acuson 128 XP 10 with 7.0 MHz linear probe for the extracranial vascular system, and with 2 MHz sector probe for transcranial visualization. Acuson Seqouia TM 512 apparatus was applied in the latter half of the trial. Results: In accordance with digital subtraction angiography (DSA) 42 AVMs were visualized by means of sonography (sensitivity 77.8 %). The blood-vessels supplying an angioma were identified on the base of typical hemodynamic parameters (increased systolic and diastolic flow velocity, decreased index of pulsatility). AVMs located subcortically could be visualized with difficulties. On the contrary, AVMs situated in the axial plane in basal regions of the brain were visualized best (sensitivity 88.9 %). TCCS showed to be most helpful in assessing the post-operative course or the course after embolizing interventions. Conclusion: TCCS is a valuable diagnostic method for visualizing AVM as well as for evaluating the course after interventions on AVMs. However, this method should not be applied as a screening examination.

        Key words: transcranial color-coded duplex sonography, transcranial doppler sonography, arteriovenous malformation, angioma, sonography, embolization